//
//  Model_B.m
//  工厂模式
//
//  Created by Song on 2018/5/20.
//  Copyright © 2018年 Song. All rights reserved.
//

#import "Model_B.h"

@implementation Model_B

-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSKeyValueChangeKey,id> *)change context:(void *)context {
    self.nameB = [NSString stringWithFormat:@"%@",[self class]];
    NSLog(@"self.nameB = %@ +++++++++",self.nameB);
}

@end
